Speaking in ripples

Alexei S. Trifonov

Chetan Kumar Vudadha, P. Sai Phaneendra, Syed Ershad Ahmed +3 more

Reversible computing has emerged as promising technology having its applications in quantum computing, nanotechnology and optical computing. This paper presents design and analysis of reversible ripple, prefix and prefix ripple hybrid adders. Firstly an analysis and comparison of all the existing reversible ripple carry adders is presented. The reversible ripple carry adders are characterized by high quantum depth, low quantum cost and/or low garbage outputs and ancilla inputs bits. Secondly design methodology for reversible prefix adders is presented. The reversible prefix adders are characterized by low quantum depth, high quantum cost and/or high garbage outputs and ancilla inputs bits. Finally design of the proposed reversible prefix-ripple hybrid adders is presented and comparison of the different parameters of reversible ripple, prefix and prefix-ripple hybrid adders is illustrated.

Olimpiu G. Urcan

Steven A. Cuccaro, Thomas G. Draper, Samuel Kutin +1 more

We present a new linear-depth ripple-carry quantum addition circuit. Previous addition circuits required linearly many ancillary qubits; our new adder uses only a single ancillary qubit. Also, our circuit has lower depth and fewer gates than previous ripple-carry adders.

Shaolong Wang

The phenomenon of double-slit interference is not an attribute of the electron itself, but is caused by the fluctuation of space. Because of the big bang of the universe, there has always been an explosion afterwave in space. I call it universe ripple. This kind of ripple is hard to be felt in the macro world. However, for particles with very small mass such as electrons and photons, the effect of such ripples can not be ignored.

Gordon Walter Semenoff